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7. Selected Technical Data of Imperial German U-boats and their Torpedoes

Type

Displace-mentm³

DivingDepth* [m]

Propulsion[hp]

max. Speed [kn]

Range[nm/kn]

Armament

Crew**

SM U-9(equal to SM U 10 to U 12)

493 sf 611 sm

50

2x300 hp PM +2x225 hp PM***2x580 hp EM

14,2 sf 8,1 sm

3,250/9 sf 75/5 sm

2 BT, 2 ST6 torpedoes

4 - 25

SM U 17(equal to SM U 18)

564 sf 691 sm

50

4x350 hp PM***2x560 hp EM

14,9 sf 9,5 sm

6,700/8 sf 75/5 sm

2 BT, 2 ST6 torpedoes

4 - 25

SM U 21(equal to SM U 19 to U 22)

650 sf 837 sm

50

2x850 hp DM2x600 hp EM

15,4 sf 9,5 sm

7,600/8 sf 80/5 sm

2 BT, 2 ST6 torpedoes1 x 8.8 cm UK

4 - 31

SM U-53(equal to SM U-51 to U-56)

715 sf 902 sm

50

2x1,200 hp DM2x600 hp EM

17.1 sf 9.1 sm

9,400/8 sf 55/5 sm

2 BT, 2 ST8 torpedoes2 x 8.8 cm UK

4 - 31

SM U 117(equal to SMU 118 to U 121)
Type UE II

1,164 sf 1,512 sm

75

2x1,200 hp DM2x600 hp EM

14.7 sf 7.0 sm

13,900/8 sf 35/4,5 sm

4 BT12 torpedoes42 UC200 mines(+ 32 storage)

4 - 36

SM U 135(equal to SMU 136 to U 138)
Type 42

1,175 sf 1,531 sm

75

2x1,750 hp DM2x450 hp DG2x845 hp EM

17.7 sf 8.1 sm

10,000/8 sf 50/4,5 sm

4 BT, 2 ST14 torpedoes2 x 10,5 cm UK

4 - 42

SM U 139(equal to SMU 140 to U 141)
Type U-cruiser 46

1,930 sf 2,483 sm

75

2x1,750 hp DM2x450 hp DG2x845 hp EM

15.8 sf 7.6 sm

12,630/8 sf 53/4,5 sm

4 BT, 2 ST19 torpedoes2 x 15.0 cm UK

6 - 56(+ 1/20 prize-crew)

SM U 151(equal to SMU 152 to U 157)
former merchant U-boat

1,512 sf 1,875 sm

50

2x400 hp DM2x400 hp EM

12.4 sf 5.2 sm

25,000/5.5 sf 65/3 sm

2 BT18 torpedoes2 x 15.0 cm2 x 10,5 UK

6 - 50(+ 1/20 prize-crew)

SM UB 13(equal to SMUB 9 to UB 17)
Type UB I

127 sf 141 sm

50

1x60 hp DM1x120 hp EM

6.5 sf 5.5 sm

1,650/5 sf 45/4 sm

2 BT2 torpedoes1 MG

1 - 13

SM UB 29(equal to SMUB 24 to UB 28)
Type UB II

263 sf 292 sm

50

2x142 hp DM2x140 hp EM

9.2 sf 5.8 sm

6,500/5 sf 45/4 sm

2 BT4 torpedoes1 x 5.0 cm UK

2 - 21

SM UB 116(equal to SMUB 103 to UB 117)
Type UB III

516 sf 651 sm

50

2x550 hp DM2x394 hp EM

13.6 sf 8.0 sm

8,500/6 sf 55/4 sm

4 BT,1 ST10 torpedoes1 x 8,8 cm UK

3 - 31

SM UC 1(equal to SMUC 2 to UC 10)
Type UC I

168 sf 183 sm

50

1x90 hp DM1x175 hp EM

6.2 sf 5.2 sm

750/5 sf 50/4 sm

12 UC 120 mines

1 - 13

SM UC 71(equal to SMUC 65 to UC 73)
Type UC II

417 sf 493 sm

50

2x350 hp DM2x230 hp EM

11.6 sf 7.0 sm

9,430/7 sf 55/4 sm

2 BT, 1 ST7 torpedoes1 x 10,5 cm UK18 UC 200 mines

3 - 23

SM UC 80(equal to SMUC 81 to UC 86)
Type UC III

474 sf 560 sm

50

2x300 hp DM2x385 hp EM

11.5 sf 6.6 sm

8,400/7 sf 40/4,5 sm

2 BT, 1 ST7 torpedoes1 x 10,5 cm UK18 UC 200 mines

3 - 29

* All German U-boats were engineered with a diving depth safety factor of 2.5. That
means that at a constructed diving depth (Konstruktionstauchtiefe) of 50 m, the probable destruction depth
of the pressure hull was about 125m.
** First number shows the officers, the second the senior and junior rates.
*** Körting petrol motor

The 45 cm torpedoes were used only by the U-boats SM U 1 to U 18, SM U-66
to U-70, SM UB 1 to UB 17.
All torpedoes were equipped with a device allowing the torpedo to be shot at an angle to the
Target of up +/- 90 degrees.